JSTL Function Causing JDev Designer to Hide Field

I added a JSTL function to an OutputText field in an ADF Web application. The function itself works at run-time; however, in the JDev Designer, the Designer does not display the field.
What I did was this:
1. Added the namespace prefix to the page fragment:
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
xmlns:af="http://xmlns.oracle.com/adf/faces/rich"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:fn="http://java.sun.com/jsp/jstl/functions"
xmlns:c="http://java.sun.com/jsp/jstl/core">
2. Added the function to an af:outputText. To keep this post simple, in the below example i just used 'MMM' as the fn:toLowerCase() param value:
<af:panelLabelAndMessage label="#{viewcontrollerBundle.LOGGER_PROTOTYPE_2}" id="plam4"
rendered="#{bindings.Type1.inputValue !=2 and bindings.MessageLevelId.inputValue != 0}">
<af:outputText value="#{fn:toLowerCase('MMM')}" id="ot4"
inlineStyle="font-family:'Courier New', Courier, monospace;"/>
</af:panelLabelAndMessage>
At runtime 'MMM' is correctly displayed as 'mmm'. However, the field is not visible in the JDev Designer - which will make this confusing to maintain. Is there something I am doing wrong, or am i missing a step?
Versions: JDeveloper 11.1.1.6, Linux. JSTL functions library is for v. 1.2.
Thanks for your help.

There is no JDev version 11.1.1.6.0 (at least officially).
Anyway, can you check what you see if you add some static text in front of the EL.
I guess jdev tries to calculate the value, fails and you end up getting nothing (or in case of an outputText with no text which means nothing).
Timo

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